Type 98 Mini Engineer Vehicle was developed for the destruction of the Soviet pillbox in the Manchuria border. It runs with remote-controlled by cables and sets an explosive near pillbox. Ya-I Go had two models, Ko and Otsu.

Ya-I Go was deployed in the 27th Independent Engineer Regiment in Manchuria. However, Ya-I Go did not see action and all were destroyed when the war ended.

Note: This vehicle is usually called "Type 97 Yi-Go". But, recently it is known that "Type 98 Ya-I Go" is the correct designation.